CN105874681A - Power supply system - Google Patents
Power supply system Download PDFInfo
- Publication number
- CN105874681A CN105874681A CN201580003499.4A CN201580003499A CN105874681A CN 105874681 A CN105874681 A CN 105874681A CN 201580003499 A CN201580003499 A CN 201580003499A CN 105874681 A CN105874681 A CN 105874681A
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- China
- Prior art keywords
- lithium ion
- parallel
- ion battery
- nonaqueous electrolytic
- rechargeable nonaqueous
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M16/00—Structural combinations of different types of electrochemical generators
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
- B60L58/21—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules having the same nominal voltage
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Electrochemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Sustainable Development (AREA)
- Mechanical Engineering (AREA)
- Transportation (AREA)
- Sustainable Energy (AREA)
- Life Sciences & Earth Sciences (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
In a system of the present invention, said system having secondary batteries connected in parallel, a discharge rate of one of the secondary batteries is prevented from becoming higher than a predetermined discharge rate. A first electricity storage section (10) and a second electricity storage section (20) are connected in parallel. The first electricity storage section (10) includes first non-aqueous electrolyte secondary batteries. The second electricity storage section (20) includes second non-aqueous electrolyte secondary batteries that are connected in parallel. The second non-aqueous electrolyte secondary batteries have a higher energy density than the first non-aqueous electrolyte secondary batteries. Even in the cases where electricity is discharged from the second electricity storage section (20) at a current value equivalent to an estimated maximum discharge current value of the first non-aqueous electrolyte secondary battery, the number of the second non-aqueous electrolyte secondary batteries to be connected in parallel is set such that the discharge rate of the second non-aqueous electrolyte secondary batteries is equal to or less than a reference discharge rate.
Description
Technical field
The present invention relates to a kind of power-supply system being equipped on vehicle.
Background technology
In recent years, hybrid vehicle, electric automobile are the most gradually popularized.It is equipped with row on these vehicles
Sailing and use motor, and be equipped with secondary cell, this secondary cell supplies electric power to electric drive motor,
Accumulate the electric power from electric drive motor regeneration.As vehicle-mounted secondary cell, generally use lithium-ion electric
Pond, Ni-MH battery.As vehicle-mounted power-supply system, it is proposed that difform cell parallel is connected
Power-supply system.Such as, it is proposed that the power-supply system (example that rectangular cell and cylindrical battery are connected in parallel
As, with reference to patent documentation 1).If being compared with cylindrical battery by rectangular cell, then the former is high defeated
Going out, the energy density of the latter is high.Thus, by both are connected in parallel, it is possible to constitute height output and height
The set of cells of capacity.
It addition, secondary cell has when with high-multiplying power discharge the character that deterioration can be made to accelerate.It addition, work as
During with high-multiplying power discharge, the behavior of change in voltage easily becomes irregular.Can be by adjusting the group of battery
One-tenth etc. improves the toleration to high-multiplying power discharge, but can cause the reduction of cost increase, battery behavior
Deng.
In the case of the parallel system that variform secondary cell is connected in parallel by design, typically
For, based on the internal resistance ratio between variform secondary cell, so that the electric discharge of each secondary cell
Multiplying power is the mode of 4C～below 8C, sets the capacity of the secondary cell of each shape, quantity in parallel.This
Outward, the ultimate value of the reality of discharge-rate is different according to the composition of battery, but at consumer's battery
In generally below 4C.
Patent documentation 1: International Publication the 2013/157049th
Summary of the invention
The problem that invention is to be solved
But, variform two secondary cells carrying out being connected in parallel not are the most in the same manner
Carry out discharging.That is, electric current may not necessarily enter based on internal resistance ratio when comparing under identical conditions
Row flowing.The experiment carried out by the present inventor, it is thus identified that situations below: though based on
Internal resistance ratio and in the case of being designed to less than set discharge-rate, owing to putting continuously for a long time
Electricity, and the discharge-rate of the secondary cell of a side the most also can exceed set discharge-rate.
The present invention completes in view of this situation, its object is to provide following a kind of technology: inciting somebody to action
In the system that secondary cell is connected in parallel, the discharge-rate of the secondary cell of a side is both become to be above
The situation of fixed discharge-rate suppresses.
For solving the scheme of problem
In order to solve the problems referred to above, the power-supply system of certain mode of the present invention possesses: the first Reserve Power Division,
It includes the first rechargeable nonaqueous electrolytic battery；And second Reserve Power Division, it is with described first Reserve Power Division also
Connection connects, including carrying out multiple second rechargeable nonaqueous electrolytic batteries of being connected in parallel.Described second non-aqueous
Electrolyte secondary battery is that energy density is higher than the energy density of described first rechargeable nonaqueous electrolytic battery
Secondary cell, described second rechargeable nonaqueous electrolytic battery is relative to described first nonaqueous electrolyte secondary
The internal resistance ratio of battery is set to the scope of 10～35, stores based on according to described first be connected in parallel
Electricity portion and described second Reserve Power Division system imagination maximum discharge current value and described internal resistance ratio and
First imagination maximum discharge current value of described first rechargeable nonaqueous electrolytic battery calculated, so that institute
State the mode of below the reference discharge multiplying power that discharge-rate is regulation of the first rechargeable nonaqueous electrolytic battery,
Set the capability value of described first Reserve Power Division, imagine maximum discharge current value, institute based on according to described system
The institute stating internal resistance ratio and the quantity in parallel of described second rechargeable nonaqueous electrolytic battery and calculate
State the second imagination maximum discharge current value of the second rechargeable nonaqueous electrolytic battery, so that described second non-aqueous
The discharge-rate of electrolyte secondary battery is the mode of below described reference discharge multiplying power, sets described second
The capability value of Reserve Power Division, sets the number in parallel of described second rechargeable nonaqueous electrolytic battery as follows
Amount: even if to imagine the suitable current value of maximum discharge current value from described second electric power storage with described first
In the case of discharging in portion, the discharge-rate of described second rechargeable nonaqueous electrolytic battery is also described base
Below quasi-discharge-rate.
The effect of invention
In accordance with the invention it is possible to it is electric to the secondary of a side in the system that secondary cell is connected in parallel
The discharge-rate in pond becomes to be above the situation of set discharge-rate to be suppressed.
Accompanying drawing explanation
Fig. 1 is the figure of the structure representing the power-supply system involved by embodiments of the present invention.
Fig. 2 is to represent rectangular lithium ion battery A and cylindrical shape lithium ion battery B or cylindrical shape lithium-ion electric
The figure of the measurement result of the internal resistance ratio of pond BB.
Fig. 3 is to represent the taken in conjunction from being made up of rectangular lithium ion battery A and cylindrical shape lithium ion battery B
Unite with the system voltage in the case of the electric current continuous discharge of 50A, the electric discharge electricity of rectangular lithium ion battery A
The figure of the change of the discharge current of stream and cylindrical shape lithium ion battery B.
Fig. 4 is the quantity in parallel to cylindrical shape lithium ion battery B, the share current often organizing parallel connection, electric discharge times
The figure that the relation of rate is summarized.
Detailed description of the invention
Fig. 1 is the figure of the structure representing the power-supply system 100 involved by embodiments of the present invention.Power supply system
System 100 is equipped on hybrid vehicle or electric automobile, and the load 200 in vehicle supplies electric power.At this
In embodiment, as the load 200 in vehicle, it is contemplated that electric drive motor.Power-supply system 100 and row
Sail and be attached via not shown inverter with motor.Inverter will supply from power-supply system 100
DC voltage conversion is to be supplied to electric drive motor, by supply from electric drive motor after alternating voltage
Alternating voltage is supplied to power-supply system 100 after being transformed to DC voltage.
Electric drive motor is made up of phase AC synchronous motor.In the present embodiment, it is contemplated that can
The high capacity motor travelled merely with the torque of electric drive motor.Electric drive motor is run at power
Time carry out rotation based on the electric power supplied from power-supply system 100 and make vehicle travel, pass through base when regeneration
Rotation in the deceleration energy of vehicle generates electricity, by the power supply that sends to power-supply system 100.
Power-supply system 100 possess the 10, second Reserve Power Division, the first Reserve Power Division 20, first switch SW1, second
Switch SW2, the first current measuring element R1, the second current measuring element R2 and control device 40.
First Reserve Power Division 10 is connected in parallel with the second Reserve Power Division 20, supplies electric power to load 200 with being integrally forming.
Below, in the present embodiment, it is contemplated that the power-supply system 100 of 200V.
First Reserve Power Division 10 includes multiple lithium ionic cell unit S11～S156 being connected in series.Lithium-ion electric
The representative voltage in pond is 3.6～3.7V, in the present embodiment, it is contemplated to 200V system, therefore by 56
Lithium ionic cell unit S11～S156 is connected in series.
Second Reserve Power Division 20 includes that multiple series-connected cell element circuit, each series-connected cell element circuit are by many
Individual lithium ionic cell unit is connected in series.Multiple series-connected cell element circuits are connected in parallel.
In FIG, the first series-connected cell unit 56 lithium ionic cell unit S21～256 being connected in series
Circuit, the second series-connected cell unit electricity that 56 lithium ionic cell unit S31～S356 are connected in series
Road ..., the n-th series-connected cell unit that 56 lithium ionic cell unit Sn1～Sn56 are connected in series
Circuit is connected in parallel.
Additionally, in the first Reserve Power Division 10 and the second Reserve Power Division 20, employ lithium ion battery, but only
If rechargeable nonaqueous electrolytic battery, it is possible to use the battery beyond lithium ion battery.
The lithium-ion electric used in the lithium ion battery used in first Reserve Power Division 10 and the second Reserve Power Division 20
Pond uses the lithium ion battery that battery structure is different.Use low-impedance collector component (such as, metallic plate)
Battery can improve output characteristics, but with the electricity of the collector component (such as, foil) using high impedance
Pond phase specific volume easily becomes big.That is, compared with the battery of the collector component using high impedance, low-resistance is used
The battery of anti-collector component illustrates the trend that energy density diminishes relatively.About this point, even phase
With the battery of composition, also show that identical trend.Along with the parts beyond the power generation element of battery become big,
The capacity of per unit volume reduces, and energy density diminishes.
At the battery by using the battery of low-impedance collector component and the collector component of use high impedance also
In the system that connection is formed by connecting, it is possible to supply the electric power of high output from the former, and can be increased by the latter
The capacity of big system entirety, the capacity of per unit volume.On the other hand, the collector component of high impedance is when stream
During logical big electric current, heating, can make the deterioration of battery accelerate.
In the present embodiment, in the first Reserve Power Division 10, use square lithium ion battery, store second
Electricity portion 20 uses columnar lithium ion battery.Columnar lithium ion battery is as the lithium of consumer
Ion battery and widely available.Square lithium ion battery is general mainly as vehicle-mounted lithium ion battery
And.
Square lithium ion battery uses low-impedance collector component, for the battery of height output.On the other hand,
Columnar lithium ion battery uses the collector component of high impedance, it is possible to constitute energy density height and high power capacity
Battery.Rectangular cell is the most identical with the basic power generation element of cylindrical battery (electrode body, electrolyte),
Therefore battery behavior is the most roughly the same.But, by the mechanism members such as outer tinning, the pad-face of electrode body
Long-pending etc. account in the case of, output, cycle characteristics can produce difference.As it has been described above, collector component
The energy density of the cylindrical battery being made up of foil etc. is high, and productivity ratio is the highest.But, collector component
Impedance uprises, and therefore when taking out the electric current of height output, deterioration is accelerated.On the other hand, in energy density
From the point of view of in viewpoint, the energy density of the rectangular cell that collector component is made up of metallic plate etc. is not as good as cylindrical shape electricity
The energy density in pond, but even if the electric current taking out height output also is able to obtain degradation inhibiting little.
Thus, constituting, square lithium ion battery is connected in parallel with columnar lithium ion battery
System in the case of, need be designed to avoid big electric current to flow through columnar lithium ion battery.Design side
The details of method are described below.
First switch SW1 be inserted into the positive terminal of the first Reserve Power Division 10 and high voltage side current bus it
Between.Second switch SW2 be inserted into the positive terminal of the second Reserve Power Division 20 and high voltage side current bus it
Between.As the first switch SW1 and second switch SW2, it is possible to use relay, IGBT, MOSFET
Deng.
The negative terminal that first current measuring element R1 is connected to the first Reserve Power Division 10 is total with low-pressure side electric current
Between line.Second current measuring element R2 is connected to negative terminal and the low-pressure side electric current of the second Reserve Power Division 20
Between bus.As the first current measuring element R1 and the second current measuring element R2, use shunting electricity
Resistance or Hall element.
Controlling device 40 is for the first Reserve Power Division 10 and the second Reserve Power Division 20 are managed the dress controlled
Put, possess first voltage and current detection circuit the 41, second voltage and current detection circuit 42, process portion 43,
Drive circuit 44.
First voltage and current detection circuit 41 detects the multiple lithium ion batteries included by the first Reserve Power Division 10
The voltage of each unit in cell S 11～S156.Each list that first voltage and current detection circuit 41 will detect
The magnitude of voltage of unit exports process portion 43.It addition, the first voltage and current detection circuit 41 detects the first electric current
The both end voltage of detecting element R1, exports process portion by the current value corresponding with the both end voltage detected
43。
Second voltage and current detection circuit 42 detects the multiple lithium ion batteries included by the second Reserve Power Division 20
The voltage of each unit in cell S 21～Sn56.Each list that second voltage and current detection circuit 42 will detect
The magnitude of voltage of unit exports process portion 43.It addition, the first voltage and current detection circuit 41 detects the second electric current
The both end voltage of detecting element R2, exports process portion by the current value corresponding with the both end voltage detected
43.First voltage and current detection circuit 41 and the second voltage and current detection circuit 42 can be by as special
The ASIC (Application Specific Integrated Circuit: special IC) of customization IC is constituted.
Both can be made up of a chip, it is also possible to be made up of two chips.
Process portion 43 can be made up of CPU, ROM, RAM, it is possible to via not shown
CAN (Controller Area Network: controller local area network) and with not shown vehicle side
ECU (Electronic Control Unit: electronic control unit) communicates.Process portion 43 is based on by the first voltage
Magnitude of voltage and/or current value that current detection circuit 41 detects estimate the first Reserve Power Division 10
SOC (State Of Charge: state-of-charge).SOC such as can pass through OCV (Open Circuit
Voltage: open-circuit voltage) method or electric current cumulative method estimate.These methods of estimation are general technology,
Therefore description is omitted.Similarly, process portion 43 examines based on by the second voltage and current detection circuit 42
The magnitude of voltage measured and/or current value estimate the SOC of the second Reserve Power Division 20.
Process portion 43 SOC based on the first Reserve Power Division 10 estimated and/or the indication signal from ECU,
Generate the control signal for controlling the first on/off switching SW1.Such as, in the first Reserve Power Division 10
In the case of overdischarge or in the case of overcurrent flows through the first Reserve Power Division 10, generate for by first
Switch SW1 controls the control signal for disconnecting.Similarly, process portion 43 is based on the second electric power storage estimated
The SOC in portion 20 and/or the indication signal from ECU, generate the connection for controlling second switch SW2/
The control signal disconnected.These control signals are output to drive circuit 44.Drive circuit 44 based on from
The control signal in process portion 43, generates and switchs the driving signal of SW1 for on/off first and be used for
The driving signal of on/off second switch SW2.
Below, the lithium ion battery of use in the first Reserve Power Division 10 and the second Reserve Power Division 20 respectively is described
Capacity, the establishing method of quantity in parallel.Additionally, in the present embodiment, it is contemplated that by the first Reserve Power Division 10
Quantity in parallel be fixed as 1 example.That is, do not make rectangular lithium ion battery in parallel, and only make cylindrical shape
Lithium ion battery is in parallel.The second Reserve Power Division is adjusted by the quantity in parallel adjusting cylindrical shape lithium ion battery
The capacity of 20, and then it is overall to adjust the parallel system that is made up of the first Reserve Power Division 10 and the second Reserve Power Division 20
Capacity.
As the rectangular lithium ion battery used in the first Reserve Power Division 10, use nominal voltage is 3.6V, appearance
Amount is the lithium ion battery A of 25.0Ah.As the cylindrical shape lithium ion battery used in the second Reserve Power Division 20,
Use nominal voltage is 3.6V, capacity is the lithium ion battery B of 3.0Ah or nominal voltage is 3.6V, appearance
Amount is the lithium ion battery BB of 2.0Ah.Lithium ion battery B and lithium ion battery BB belongs to 18650 types
Lithium ion battery.
Fig. 2 is to represent rectangular lithium ion battery A and cylindrical shape lithium ion battery B or cylindrical shape lithium-ion electric
The figure of the measurement result of the internal resistance ratio of pond BB.(a) of Fig. 2 represents rectangular lithium ion battery A and cylinder
The measurement result of the internal resistance ratio of shape lithium ion battery B, (b) of Fig. 2 represent rectangular lithium ion battery A with
The measurement result of the internal resistance ratio of cylindrical shape lithium ion battery BB.
To from rectangular lithium ion battery A, cylindrical shape lithium ion battery B and cylindrical shape lithium ion battery BB
Each resistance value in the case of discharging with same current value is measured.It addition, each internal resistance
Ratio is that the ratio to each resistance value determined in the environment of identical conditions calculates and obtains.Example
As, in the environment of 25 DEG C, the SOC of rectangular lithium ion battery A and cylindrical shape lithium ion battery B is 20%
Time, both internal resistance ratios are 29.2.It addition, in the environment of-10 DEG C rectangular lithium ion battery A and
When the SOC of cylindrical shape lithium ion battery B is 20%, both internal resistance ratios are 21.4.
In the following description, it is contemplated that rectangular lithium ion battery A is used as included by the first Reserve Power Division 10
Lithium ionic cell unit, cylindrical shape lithium ion battery B is used as the lithium ion included by the second Reserve Power Division 20
The example of battery unit.Lithium in this case, as shown in (a) of Fig. 2, included by the first Reserve Power Division 10
The internal resistance of the lithium ionic cell unit included by ion battery cell and the second Reserve Power Division 20 is than convergence
In the scope of 10～35.Body more closely say, converge on the scope of 20～30.
The imagination maximum discharge current value of the rectangular lithium ion battery A included by the first Reserve Power Division 10 is basis
Parallel system imagination maximum discharge current value and above-mentioned internal resistance ratio and calculate.Second stores
The imagination maximum discharge current value of the cylindrical shape lithium ion battery B included by electricity portion 20 is according to parallel system
Imagination maximum discharge current value, above-mentioned internal resistance ratio and the parallel connection of cylindrical shape lithium ion battery B
Quantity and calculate.The imagination maximum discharge current value of parallel system is to flow to load from parallel system
The imagination maximum of the discharge current of 200.In following example, it is contemplated that be 50A.
Imagination maximum discharge current value based on rectangular lithium ion battery A, so that rectangular lithium ion battery A
Discharge-rate be regulation reference discharge multiplying power below mode, set the capacity of the first Reserve Power Division 10
Value.Imagination maximum discharge current value based on cylindrical shape lithium ion battery B, so that cylindrical shape lithium-ion electric
The discharge-rate of pond B is the mode of below this reference discharge multiplying power, sets the capability value of the second Reserve Power Division 20.
In following example, reference discharge multiplying power is set as 5.0C.This reference discharge multiplying power is battery design
The value that person is set from the viewpoint of protection battery, is to derive according to experiment, simulation, empirical law etc.
The value gone out.
Assume the quantity in parallel of cylindrical shape lithium ion battery B is being set to 1, is being set by above-mentioned internal resistance ratio
In the case of being 24, the imagination maximum discharge current value of cylindrical shape lithium ion battery B is 2.4A.Cylindrical shape
The capability value of lithium ion battery B is 3.0Ah, and therefore its discharge-rate is 0.8C, meets reference discharge times
This condition below rate.
But, according to the experiment of the present inventor, it is known even if setting according to above-mentioned method
In the case of determining capability value and the quantity in parallel of cylindrical shape lithium ion battery B, there is also cylindrical shape lithium ion
The discharge-rate of battery B exceedes the situation of reference discharge multiplying power.
Fig. 3 is to represent the taken in conjunction from being made up of rectangular lithium ion battery A and cylindrical shape lithium ion battery B
Unite with the system voltage in the case of the electric current continuous discharge of 50A, the electric discharge electricity of rectangular lithium ion battery A
The figure of the change of the discharge current of stream and cylindrical shape lithium ion battery B.About cylindrical shape lithium ion battery
B, to make rectangular lithium ion battery A in parallel with the resistance ratio of the cylindrical shape lithium ion battery B mode as 1:4
Connect the cylindrical shape lithium ion battery B having stated number.Overall capacity as parallel system is 40Ah,
Electric discharge is started from the state that the SOC of parallel system is 50%.The voltage when electric discharge of parallel system starts
For 3.7V, final discharging voltage is 2.5V.
Initial in electric discharge, according to the ratio of the internal resistance determined under identical conditions to determine square lithium
The electric current of ion battery A and cylindrical shape lithium ion battery B is shared.But, process over time, cylinder
The electric current of shape lithium ion battery B is shared and being sharply increased.Speculate this be due to: along with electric discharge carrying out, side
Shape lithium ion battery A deviates with the SOC of cylindrical shape lithium ion battery B, and internal resistance than unlike
Change as Suo Shexiang.The SOC of rectangular lithium ion battery A is gradually lowered at faster speed,
Therefore the internal resistance of rectangular lithium ion battery A is gradually increasing (with reference to Fig. 2) at faster speed, internal electricity
Resistance ratio tapers into.
As it is shown on figure 3, along with the carrying out of electric discharge, cylindrical shape lithium ion battery B and rectangular lithium ion battery A
The internal resistance reversion of both, the discharge current of cylindrical shape lithium ion battery B and rectangular lithium ion battery
The discharge current reversion of A.When system voltage reaches the 2.5V of final discharging voltage, cylindrical shape lithium ion
The discharge current of battery B is 40.0A, and the discharge current of rectangular lithium ion battery A is 10.0A.This with put
Electric both initial relations are contrary.
Based on above understanding, by the number in parallel of the cylindrical shape lithium ion battery B included by the second Reserve Power Division 20
Amount is set to: even if with the electric current suitable with the imagination maximum discharge current value of rectangular lithium ion battery A
Be worth from second Reserve Power Division 20 electric discharge in the case of, the discharge-rate of cylindrical shape lithium ion battery B also on the basis of
Below discharge-rate.In the example in figure 3, the imagination maximum discharge current value of rectangular lithium ion battery A is
40A.On the basis of 10.0A, on the basis of 40.0A, do not set the parallel connection of cylindrical shape lithium ion battery B
Quantity.
The discharge current value of the cylindrical shape lithium ion battery B during final discharging voltage of parallel system is the most not
The imagination maximum discharge current value of rectangular lithium ion battery A can be exceeded, if with rectangular lithium ion battery A
Imagination maximum current value on the basis of set quantity in parallel, the then electric discharge of cylindrical shape lithium ion battery B times
Rate is not over reference discharge multiplying power.
Fig. 4 is the quantity in parallel to cylindrical shape lithium ion battery B, the share current averagely often organizing parallel connection, puts
The figure that the relation of electricity multiplying power is summarized.Imagination maximum discharge current is 40.0A, and therefore quantity in parallel is 1
In the case of the average share current often organizing parallel connection be 40.0A.The capacity of cylindrical shape lithium ion battery B is
3.0Ah, the discharge-rate in the case of being therefore somebody's turn to do is 13.3C.Reference discharge multiplying power is set to 5.0C, because of
This quantity in parallel be 1 structure be unsatisfactory for the condition of discharge-rate.Quantity in parallel is average in the case of 2
The share current often organizing parallel connection is 20.0A.Discharge-rate in the case of Gai is 6.7C, and quantity in parallel is 2
Structure is also unsatisfactory for the condition of discharge-rate.Quantity in parallel be the average the most often group in the case of 3 in parallel point
Load electric current is 13.3A.Discharge-rate in the case of Gai is 4.4C, and quantity in parallel is the satisfied electric discharge of structure of 3
The condition of multiplying power.The quantity structure more than 3 the most in parallel also meets the condition of discharge-rate.
Thus, the quantity in parallel of the cylindrical shape lithium ion battery B included by the second Reserve Power Division 20 is set to 3
Above.Additionally, when more than 9 groups of parallel connections, the capacity of the second Reserve Power Division 20 becomes more than 27.0Ah, because of
This is more than the capacity of the first Reserve Power Division 10.In this case, when considering by variform cell parallel even
During the various cost connect, it is possible to total when being judged as the rectangular lithium ion battery A parallel connection by two 25.0Ah
Cost is lower.Thus, the quantity quilt in parallel of the cylindrical shape lithium ion battery B included by the second Reserve Power Division 20
It is set as that the scope of 3～8 is most suitable.
As discussed above, according to present embodiment, by rectangular lithium ion battery and cylindrical shape
In the system that lithium ion battery is connected in parallel, it is possible to the discharge-rate of cylindrical shape lithium ion battery is become
Must suppress higher than the situation of set discharge-rate.Thus, high output and height can be constituted enjoying
While the advantage of the such parallel system of set of cells of capacity, it is possible to protect cylindrical shape lithium ion perfectly soundly
Battery.
The durability of cylindrical shape lithium ion battery is lower than the durability of rectangular lithium ion battery, but by pressing down
The deterioration of rounding tubular lithium ion battery, it is possible to suppress both life-spans to produce the situation of deviation.It addition,
If able to the discharge-rate of suppression cylindrical shape lithium ion battery, then without cylindrical shape lithium ion battery is chased after
Add the special construction of protection.Thus, be designed to suppress the discharge-rate of cylindrical shape lithium ion battery be
Great significance is had technically below set discharge-rate.
In the past, in the parallel system being made up of rectangular lithium ion battery and cylindrical shape lithium ion battery, root
According to the ratio of the internal resistance determined under identical conditions to determine each capability value and quantity in parallel.Former
This, when go out to send from both internal resistance ratios account for time, it should flow through cylinder almost without electric current
Shape lithium ion battery.But, be specify that by experiment there are in fact and flow out from cylindrical shape lithium ion battery
The probability of big electric current.I.e., it is known that it not is to measure according only under identical conditions that both electric currents are shared
The ratio of the internal resistance gone out and determine.According to present embodiment, i.e. become from the second Reserve Power Division 20
Release the state of big electric current, it is also possible to avoid cylindrical shape lithium ion battery included by the second Reserve Power Division 20
Discharge-rate is more than 5.0C such that it is able to protection cylindrical shape lithium ion battery.
In electric automobile, rectangular lithium ion battery is used to till SOC is about 10%, electric discharge electricity
Pressure is reduced near 2.5V sometimes.Thus, the probability of big electric current is released from cylindrical shape lithium ion battery
The lowest, it is impossible to ignore.
Above, the present invention is illustrated based on embodiment.It should be appreciated by those skilled in the art that these are real
The mode of executing is to illustrate, and these each structural elements, the combination of variety of processes can exist various variation,
And this variation is intended to be included within the scope of the present invention.
Such as, be 3.6V by nominal voltage, capacity be 2.0Ah lithium ion battery BB be used as second storage
In the case of lithium ionic cell unit included by electricity portion 20, it is also possible to apply above-mentioned method for designing.Separately
Outward, there is being made up of also rectangular lithium ion battery and cylindrical shape lithium ion of capability value other than the above
Contact system also is able to apply above-mentioned method for designing.
Description of reference numerals
100: power-supply system；10: the first Reserve Power Divisions；S11, S12, S13, S156: rectangular cell list
Unit；R1: the first current measuring element；SW1: the first switch；20: the second Reserve Power Divisions；S21、S22、
S23、S256、S31、S32、S33、S356、S31、S32、S33、S356、Sn1、Sn2、Sn3、
Sn56: cylindrical battery unit；R2: the second current measuring element；SW2: second switch；40: control
Device processed；41: the first voltage and current detection circuits；42: the second voltage and current detection circuits；43: place
Reason portion；44: drive circuit；200: load.
Claims (4)
1. a power-supply system, it is characterised in that possess:
First Reserve Power Division, it includes the first rechargeable nonaqueous electrolytic battery；And
Second Reserve Power Division, it is connected in parallel with described first Reserve Power Division, multiple including carry out being connected in parallel
Second rechargeable nonaqueous electrolytic battery,
Wherein, described second rechargeable nonaqueous electrolytic battery is that energy density is than described first nonaqueous electrolyte
The secondary cell that the energy density of secondary cell is high,
Described second rechargeable nonaqueous electrolytic battery is relative to described first rechargeable nonaqueous electrolytic battery
Internal resistance ratio is set to the scope of 10～35,
Imagine based on the system according to described first Reserve Power Division being connected in parallel and described second Reserve Power Division
Big discharge current value and described internal resistance ratio and the described first nonaqueous electrolyte secondary electricity that calculates
The first imagination maximum discharge current value in pond, so that the electric discharge of described first rechargeable nonaqueous electrolytic battery times
Rate is the mode of below the reference discharge multiplying power of regulation, sets the capability value of described first Reserve Power Division,
Maximum discharge current value, described internal resistance ratio and described second is imagined based on according to described system
The quantity in parallel of rechargeable nonaqueous electrolytic battery and described second rechargeable nonaqueous electrolytic battery that calculates
The second imagination maximum discharge current value so that the discharge-rate of described second rechargeable nonaqueous electrolytic battery
For the mode below described reference discharge multiplying power, set the capability value of described second Reserve Power Division,
Set the quantity in parallel of described second rechargeable nonaqueous electrolytic battery as follows: though with
The described first imagination suitable current value of maximum discharge current value carries out from described second Reserve Power Division discharging
In the case of, the discharge-rate of described second rechargeable nonaqueous electrolytic battery be also described reference discharge multiplying power with
Under.
Power-supply system the most according to claim 1, it is characterised in that
Set the quantity in parallel of described second rechargeable nonaqueous electrolytic battery as follows: described second stores
The capability value in electricity portion is less than the capability value of described first Reserve Power Division.
Power-supply system the most according to claim 1 and 2, it is characterised in that
Described reference discharge multiplying power is set to 5.0C.
Power-supply system the most according to claim 3, it is characterised in that
Described first rechargeable nonaqueous electrolytic battery be capability value be the rectangular cell of 25.0Ah,
Described second rechargeable nonaqueous electrolytic battery be capability value be the cylindrical battery of 3.0Ah,
The quantity in parallel of described second rechargeable nonaqueous electrolytic battery is set to the scope of 3～8.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2014-071844 | 2014-03-31 | ||
| JP2014071844 | 2014-03-31 | ||
| PCT/JP2015/000338 WO2015151374A1 (en) | 2014-03-31 | 2015-01-27 | Power supply system |
Publications (2)
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| CN105874681A true CN105874681A (en) | 2016-08-17 |
| CN105874681B CN105874681B (en) | 2018-11-27 |
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| Country | Link |
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| US (1) | US9847563B2 (en) |
| JP (1) | JP6352399B2 (en) |
| CN (1) | CN105874681B (en) |
| WO (1) | WO2015151374A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109874357A (en) * | 2016-10-17 | 2019-06-11 | 株式会社日立制作所 | Battery system |
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| US20170063127A1 (en) * | 2015-08-26 | 2017-03-02 | The Aes Corporation | Battery Backup Capacity Method and System |
| JP6593659B2 (en) * | 2015-11-13 | 2019-10-23 | パナソニックＩｐマネジメント株式会社 | Nonaqueous electrolyte battery and nonaqueous electrolyte battery member |
| JP2017139844A (en) * | 2016-02-01 | 2017-08-10 | 川崎重工業株式会社 | Electric power storage unit |
| CN108604715B (en) * | 2016-03-01 | 2021-04-23 | 株式会社村田制作所 | Battery pack and charge/discharge control method |
| KR102236384B1 (en) * | 2017-10-27 | 2021-04-05 | 주식회사 엘지화학 | Apparatus for battery balancing and battery pack including the same |
| KR20210138823A (en) * | 2020-05-11 | 2021-11-22 | 삼성디스플레이 주식회사 | Organic electroluminescence device and polycyclic compound for organic electroluminescence device |
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| Publication number | Publication date |
|---|---|
| JPWO2015151374A1 (en) | 2017-04-13 |
| US9847563B2 (en) | 2017-12-19 |
| US20170125869A1 (en) | 2017-05-04 |
| CN105874681B (en) | 2018-11-27 |
| JP6352399B2 (en) | 2018-07-04 |
| WO2015151374A1 (en) | 2015-10-08 |
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